// 非法值: ts=0,value无意义
func GetLast(endpoint, counter string) *cmodel.RRDData {
dsType, step, exists := index.GetTypeAndStep(endpoint, counter)
if !exists {
return cmodel.NewRRDData(0, 0.0)
}
if dsType == g.GAUGE {
return GetLastRaw(endpoint, counter)
}
if dsType == g.COUNTER || dsType == g.DERIVE {
md5 := cutils.Md5(endpoint + "/" + counter)
items := store.GetAllItems(md5)
if len(items) < 2 {
return cmodel.NewRRDData(0, 0.0)
}
f0 := items[0]
f1 := items[1]
delta_ts := f0.Timestamp - f1.Timestamp
delta_v := f0.Value - f1.Value
if delta_ts != int64(step) || delta_ts <= 0 {
return cmodel.NewRRDData(0, 0.0)
}
if delta_v < 0 {
// when cnt restarted, new cnt value would be zero, so fix it here
delta_v = 0
}
return cmodel.NewRRDData(f0.Timestamp, delta_v/float64(delta_ts))
}
return cmodel.NewRRDData(0, 0.0)
}
// 非法值: ts=0,value无意义
func GetLastRaw(endpoint, counter string) *cmodel.RRDData {
md5 := cutils.Md5(endpoint + "/" + counter)
item := store.GetLastItem(md5)
return cmodel.NewRRDData(item.Timestamp, item.Value)
}